Jose Beltran, a Court of Common Pleas worker, told the News Journal in Wilmington that he was walking into the courthouse lobby when he heard shots.

“I saw two shots,” he said. “I saw people going on the ground so I just made a U-turn and ran out of the building,” he said. “After that I don’t know what happened.”

Thomas Warren told the newspaper that as he approached the courthouse entrance to report for jury duty, he saw what appeared to be the body of a man lying on his stomach.

Local and federal authorities, including agents from the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, responded.

The courthouse was evacuated and police were doing a floor-by-floor search of the 12-story building to make sure there was only the single gunman and there were no more threats, Shavack said.

The shooting came on the day the police chief of Wilmington was scheduled to be in Philadelphia to attend a roundtable discussion about gun safety. Vice President Joe Biden, law enforcement officials and members of Congress were expected to be there.